Device for cooling coolant in a gas turbine and gas and steam turbine with said device

Abstract

The aim of the invention is a device for coolant cooling in a gas turbine which, with a relatively simple construction and low plant complexity permits a particularly high degree of efficiency in using the heat produced on cooling the coolant from a gas turbine. Said aim is achieved, whereby a number of interconnected evaporator tubes for a flow medium, are arranged in a coolant channel, connected to a gas turbine, to form forced throughflow steam generator. Said device is preferably used in a gas and steam unit with a waste heat steam generator on the exhaust gas side of a gas turbine, the heating surfaces of which are connected into the water-steam circuit of a steam turbine. The evaporator tubes of the device are thus connected on the inlet side by means of supply line to the feed water train of the water-steam circuit of the steam turbine.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of International Application No. PCT / EP02 / 05571, filed May 21, 2002 and claims the benefit thereof. The International Application claims the benefits of European application No. 01113305.5 EP, filed May 31, 2001, both applications are incorporated by reference herein in their entirety.FIELD OF INVENTION[0002]The present invention relates to a device for coolant cooling in a gas turbine. Furthermore, it relates to a gas and steam turbine with a waste heat steam generator on the exhaust gas side of a gas turbine, the heating surfaces of which are connected into the water-steam circuit of a steam turbine.BACKGROUND OF INVENTION[0003]A gas turbine, in particular in a gas and steam turbine, is usually used to generate electrical energy. To increase the performance of the gas turbine and thus to achieve the highest possible degree of efficiency, efforts are made to achieve a particularly high temperature of th...

AI Technical Summary

Benefits of technology

[0007]The object of the invention is therefore to specify a device for coolant cooling of a gas turbine which makes possible particularly high efficiency with a relatively simple construction and low plant complexity when using heat produced during cooling of the coolant of the gas turbine. In addition, a gas and steam turbine of the aforementioned type should be specified in which on the one hand good gas turbine cooling is ensured, while on the other hand, high overall efficiency of the gas and steam turbine is attained by means of a particularly effective use of the heat gained in this way.

Problems solved by technology

To increase the performance of the gas turbine and thus to achieve the highest possible degree of efficiency, efforts are made to achieve a particularly high temperature of the working substance on the inlet side of the turbine of e.g. 1200° C. to 1500° C. However, such a high turbine inlet temperature may entail material problems, in particular in relation to the heat resistance of the turbine blades and vanes.

With regard to this design objective, the results achieved to date for the transfer of heat produced during the cooling of the coolant of the gas turbine into the water-steam circuit of an assigned steam turbine have been only limited.

However, as has emerged, though slightly increased efficiency with regard to the use of heat produced during cooling of the coolant of the gas turbine is attainable in the case of such a solution, there is disproportionately high expenditure on plant technology.

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